[OSM-dev] Osmosis multi-task questions

[Lambertus]

I replied to an offlist mail from Frederik about this, but I would like 
to add some thoughts here too, now that I see this topic on the ML.

First: Working with the planet file is slow and iterating through it 
multiple times (i.e. running Osmosis multiple times) should be avoided. 
This depends on your hardware of course, maybe you'll decide it doesn't 
really matter on a very fast machine like yours.

Downloading a planet file weekly, extracting Europe into a file and 
perform more subextractions from that file won't be (much) faster then 
extracting the subextractions from the planet file directly. I reckon 
it'll be slower.

However, keeping that Europe file updated with daily diffs seems like a 
clean method to prevent plowing through a lot of useless data every week.

Using a database for this purpose is overkill imho, unless you need it 
for other things as well ofcourse.